0% 0 Electrical Engineering Quiz 26 1 / 50 It is the_________of the transformer on which the magnitude of angle of overlap depends? capacitance resistance leakage reactance any of the above 2 / 50 Which of the following loss in a D.C. generator varies significantly with the load current ? Windage loss Field copper loss Armature copper loss None of the above 3 / 50 A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________? none of the above average voltage r.m.s. voltage peak voltage 4 / 50 A certain noninverting amplifier has Ri of 1 kO and Rf of 100 kO. The closed-loop voltage gain is_____________? 100,000 101 1000 100 5 / 50 A gain of 1000 times in voltage is expressed by_______________? 60 db 120 db 30 db 600 db 6 / 50 Factors on which soil resistance depends_______________? depth of the electrode Nacl moisture all the above 7 / 50 Two 300 uH coils in series without mutual coupling have a total inductance of___________? 150 uH 75 uH 300 uH 600 uH 8 / 50 If a D.C. generator fails to build up the probable cause could not be_____________? imperfect brush contact field resistance less than the critical resistance faulty shunt connections tending to reduce the residual magnetism no residual magnetism in the generator 9 / 50 Generally, the gain of a transistor amplifier falls at high frequencies due to the___________? Coupling capacitor at the input Skin effect Coupling capacitor at the output Internal Capacitance of the device 10 / 50 The pulsating torque exerted by steam locomotives causes which of the following ? Hammer blow Jolting and skidding Pitching All of the above 11 / 50 The electrode of a direct arc furnace is made of____________? graphite tungsten copper silver 12 / 50 For radiant heating around 2250?C, the heating elements are made of____________? stainless steel alloy copper alloy carbon tungsten alloy 13 / 50 ____________ is the common method of applying brushes to the commntator? Radial Reaction All of the above Trailing 14 / 50 The leakage current in a silicon transistor is about_____________ the leakage current in a germanium transistor? One hundredth One thousandth One tenth One millionth 15 / 50 Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is__________________? TTLAS ECL TTLLS CMOS 16 / 50 A sensitive galvanometer produces large deflection for a_______________? large value of voltage large value of current small value of current large value of power 17 / 50 The starting torque of a D.C. motor is independent of which of the following? Flux Flux and armature current Speed Armature current 18 / 50 The driver stage usually employs_________________? Class C amplifier None of the above Push-pull amplifier Class A power amplifier 19 / 50 At series or parallel resonance, the circuit behaves as a ______________ load? Resistive None of the above Capacitive Inductive 20 / 50 Induction heating takes place it which of the following ? Conducting materials which are magnetic Insulating materials Conducting materials which are non-magnetic Conducting materials which may or may not be magnetic 21 / 50 Natural oil cooling is used for transformers up to a rating of____________? 250 kVA 1000 kVA 500 kVA 3000 kVA 22 / 50 A moving-coil permanent-magnet instrument can be used as flux-meter_____________? by using a high series resistance by making control springs of large moment of inertia by using a low resistance shunt by eliminating the control springs 23 / 50 To prevent a DC return between source and load, it is necessary to use___________? capacitor between source and load inductor between source and load resistor between source and load All 24 / 50 The power of a n-phase circuit can be measured by using a minimum of_______________? (n ? 1) wattmeter elements n wattmeter elements (n + 1) wattmeter elements 2n wattmeter elements 25 / 50 At absolute temperature, an intrinsic semiconductor has________________? Many holes A few free electrons Many free electrons No holes or free electrons 26 / 50 The common-mode voltage gain is________________? greater than differential voltage gain none of the above equal to differential voltage gain smaller than differentail voltage gain 27 / 50 Circuit breakers are essentially____________? current carrying contacts called electrodes circuits to break the system arc extinguishers transformers to isolate the two systems 28 / 50 In electric press, mica is used because it is _________ conductor of heat but/and __________ conductor of electricity? good, bad good, good bad, bad bad, good 29 / 50 Potential difference is the work done in moving unit positive charge form one point to another________________? in the direction of electric flux in the direction of electric intensity against electric intensity in any direction 30 / 50 For similar carrier and modulating signals, the line current used in CSI is_____________? Identical to phase voltage in VSI Identical to phase voltage in CSI Identical to line voltage in a VSI Identical to line current in VSI 31 / 50 Why are the D.C. motors preferred for traction applications ? Torque and speed are inversely proportional to armature current The speed is inversely proportional to the torque and the torque is proportional to square of armature current Torque is proportional to square root of armature current Torque is proportional to armature current 32 / 50 In order to achieve high accuracy, the slide wire of a potentiometer should be_______________? as long as possible as short as possible neither too small not too large very thick 33 / 50 In a D.C. generator, the iron losses mainly take place in___________/ armature rotor commutator armature conductors yoke 34 / 50 A certain OP-amp has bias currents of 50 ? The input offset current is_________________? 700 nA 99.3 ?A 49.7 ?A none of these 35 / 50 If an insulating material is operated beyond the maximum allowable temperature, its life is_____________? drastically reduced unaffected none of the above drastically increased 36 / 50 A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________? 6 mH 24 mH 48 mH 14 mH 37 / 50 A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is________________? (n-1)G G/n G/(n-1) nG 38 / 50 The initial response when tne output is not equal to input is called_____________? Transient response Dynamic response Error response Either of the above 39 / 50 ____________field is associated with the capacitor? None of the above Magnetic Electric Both (A) and (B) 40 / 50 Thyristor is nothing but a____________? Amplifier with large current gain Amplifier with higher gain Controlled switch Controlled transistor 41 / 50 A full wave rectifier with resistive load produces___________? Third harmonic Do not produce harmonics Second harmonic Fifth harmonic 42 / 50 Anode of an operational SCR is _______________? Always negative w.r.t cathode Always negative w.r.t anode Always positive w.r.t cathode Always positive w.r.t anode 43 / 50 If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________? 0.1 s 10 s 0.001 s 100 s 44 / 50 Which of the following capacitors can be used for temperature compensation ? Ceramic capacitor Air capacitor Paper capacitor None of the above 45 / 50 A permanent magnet______________? attracts ferromagnetic substances and repels all others attracts all paramagnetic substances and repels others attracts only ferromagnetic substances attracts some substances and repels others 46 / 50 Two 1.2 k? resistors are in series and this series combination is in parallel with a 3.3 k? resistor. The total resistance is____________? 1,389 ? 5,700 ? 138 ? 880 ? 47 / 50 __________ is invariably used for peak load Pumped storage plant None of the above Steam turbine plant Nuclear power plant 48 / 50 ___________ ICs are the most commonly used? Thin films Hybrid None of the above Monolithic 49 / 50 The current in a Zener diode is limited by _______________? Power dissipation Both (A) and (B) None of the above External resistance 50 / 50 Which of the following method is used for the speed control of DC shunt motor? rheostat control method flux control method all of the above voltage control method Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevElectrical Engineering Quiz 25 Electrical Engineering Quiz 27Next
